E d w a r p b



EDWARD ROYON,- OF'PQUA,OH10.

Letters Palent No. 76,351, dated April "I, 1868.

MPROVEMENT irl 'SCREW-CUTTING MAGHiNE.

@its ,stimule referrer tu in there` italienV izteut mit making @su .attigt smite.

T0 WHOM 1T MAY CONCERN;

Be it known thatl, EDWARD RoYoNfof PiqumMiami county, and State of Ohio,have invented a certain new and useful Screw-Cutting Machine; Vand'l dohereby ,declare the following to be a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, making partof this specification.

My invention relates to machines for cutting screw-threaded bolts andnuts, and consists,irst, in Vconsti-noting u. set of dies in diskform,'capable of rotation, if necessary, and cut die-form in severalplaces (differingin size) on the periphery, for thepurpose of adaptingone set of dies to cut several sizes of bolts; second, in npeculiarconstruction 'and arrangement of the die-chuck, by which thejawsto which the dies are attached can be expandedvund contracted by thepartial rotation of a part of the chuck, and be firmly retained in anydesired position for the required depth of cut, the retaining-devicesbeing capable of nice adjustment for dill'erent depths of' cut; third,in an improved device for holdingtaps for tapping nuts, Ste. vIntheaccompanying drawings- Y l Figure 1 is a perspective view of a machinecomplete, embodying my invention, the dies and bolts for same beingdet-ached as shown.

Figures 2, `l, and 4, :ire detached views oi' portions of the die-chuck.

Figure 5 is a rear 4view of the chuck, with the jaws open. Y

Figure 6 is a rear view of' the chnelc, with the jaws closed, showingalso the device for releasing the retainingmechanism. l

Figure 'i' exhibits theidevice for holding the taps.

A is the-frame of the machine, B the hollow shaft, C D the driving-gear,and E the dic-chuck, composed of the following parte, to wit, apermanently-attached head, F, diametricelly-divided clip G, concentricinside, and having opposing eccentric-arcsgg outside, sliding jaws H,revolving lring I, {provided with notches z',) and oppositeeccentrie-ares i i, outside plated, dies K, and bolt L. A groove, f, isturned in the head for the reception of the clip G, which rotates withinthe notches L of the jaws H, the lips g g" tting into the notches z' ofthe revolvinglring. The ends of the jaws H are eccentrically curved tofit against the corre spending cuttingsz" i" of the ring. By a partialrotation of the ring 1, tue jaws and dies are contracted orv expanded atwill, the aros it" serving to force thejaws in, and by a reversal of theclip Gr, as itis carried round with the ring, serving to force them out.The projecting pins E", fitting intocorresponding holes ,7c in the diesK, serve to adjust the dies, and the bolts L to secure them to thejavvs.

It. will be seen that the dies can be turned round to presentdifferent-sized euttingsfor different-sized bolts, The back ofthe ring Iis notched, a, and" the head F is graduated, 1 2 3 4, to indicate thedepth of cut. A plate, lili, notched at m and slotted at m', is fittedover the shaft B. A screw, N, is tapped into the head F, to receive theplate in4 any desired position, and a. tumbler, P, is pivoted'at p tothe ring I, the lip p' being adapted to it the notch m. The tumbler isforced against the plate M by the action ofl spring Q. When the ring Iis revolved, the tumbler slips into the notch m, and the jaws areretained in thatposition untilthe bolt is cut. To release thismechanism, 1 provide an incline-faced projection, p, on the tumbler,which, ou depression of Vlever R, engages the projection P, when, by o.slight rotation of shaft B, the tumbler is forced from the notch,

and the jaws H can be again expanded. By the adjustment of the plate Min the slot m, the tumbler can be made to drop into the notch in whenthe notch a is at either 1, 2, 3, or 4.

The lever R is kept up by a spring, S, and confined to a definite rangeof action. by the lip s on its shaft. Tis the sliding carriage, adapted'to hold bolts or nuts. It is fitted with right and left-hand screwstt', to oper.- ate the jaws t" t'". W is the socket for holding taps,having bushes w for different-sized taps. The shank W slips into thehollow shaft B, andis confined by, the chuck-jaws H, the nut rv, whenscrewed to the shank W', serving to prevent displacement.A By means ofthe devices w w w', at, I enable my machine to be used for tapping nuts.l

I I claim herein as new, and of my invention- 1. As herein arranged andfor the purpose explained, the hollow die-chuekE, having thepermanenthead F, clip G, with opposite eccentric-arcs g g', sliding jawsH, notched revolving ring l, eccentric t" i, and plate J'.

2. The combination of the hollow shaft B, die-chuck E, jaws H,adjustable dies K, and bolts L.

The notched and adjustable plate M, and tightening-screw N, incombination with the tuAmAbler P, ing I, and spring 4. I claim, incombination withthe screw-threadin g machine herein described, the rightand left screw tt',

jaws t`t, socket W, and nut X, all arranged as set forthn In testimonyof which invention, I hereunto set my hand.

y EDWARD ROYON. Witnesses:

GEO. H. KNIGHT, JAMES H..- LAYMAN,

